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-rw-r--r--lib/dialyzer/src/dialyzer_contracts.erl18
1 files changed, 12 insertions, 6 deletions
diff --git a/lib/dialyzer/src/dialyzer_contracts.erl b/lib/dialyzer/src/dialyzer_contracts.erl
index 7251de8b10..83b3ef72f2 100644
--- a/lib/dialyzer/src/dialyzer_contracts.erl
+++ b/lib/dialyzer/src/dialyzer_contracts.erl
@@ -126,13 +126,19 @@ butlast([H|T]) -> [H|butlast(T)].
constraints_to_string([]) ->
"";
-constraints_to_string([{type, _, constraint, [{atom, _, What}, Types]}]) ->
- atom_to_list(What) ++ "(" ++
- sequence([erl_types:t_form_to_string(T) || T <- Types], ",") ++ ")";
constraints_to_string([{type, _, constraint, [{atom, _, What}, Types]}|Rest]) ->
- atom_to_list(What) ++ "(" ++
- sequence([erl_types:t_form_to_string(T) || T <- Types], ",")
- ++ "), " ++ constraints_to_string(Rest).
+ S = constraint_to_string(What, Types),
+ case Rest of
+ [] -> S;
+ _ -> S ++ ", " ++ constraints_to_string(Rest)
+ end.
+
+constraint_to_string(is_subtype, [{var, _, Var}, T]) ->
+ atom_to_list(Var) ++ " :: " ++ erl_types:t_form_to_string(T);
+constraint_to_string(What, Types) ->
+ atom_to_list(What) ++ "("
+ ++ sequence([erl_types:t_form_to_string(T) || T <- Types], ",")
+ ++ ")".
sequence([], _Delimiter) -> "";
sequence([H], _Delimiter) -> H;